Because of possible food allergies, it's usually recommended to not feed babies common food allergens such as peanuts, eggs, wheat, dairy, and seafood until they're at least one. Waiting until they're three is even better. What's more, certain varieties of fish have high levels of mercury which children shouldn't be exposed to.

New research is challenging those old beliefs. The American Academy of Pediatrics recently revised their recommendations and now states that children as young as 4-6 months could have certain foods including fish. Further research shows that babies who eat fish before reaching 9 months have a reduced risk of eczema.

So what are new parents to do? As always, it's important to introduce new foods slowly. And speak to your child's doctor before introducing any of the foods that were previously off-limits for babies. When it comes to your child's health, it's better to be cautious.